I would like to be able to set it so that ads would appear just after the:

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when the full article (blog post) is displayed. This would make it so that ads would show after my introductory paragraph when readers come into an article from another link or search engine and would show when a reader clicks into the article from my front page.

This would be a way of installing the ads in the right place on all 2,000 of my past articles from the past nine years automatically. I've got a lot of deep informational articles from over the years that get a lot of reads.